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<?php $a = $b = 'TEST' !== 'TEST'; var_dump($a); var_dump($b);
based on LKP8G
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/jGohA
function name:  (null)
number of ops:  9
compiled vars:  !0 = $a, !1 = $b
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                           $2      !1, <false>
         1        ASSIGN                                                   !0, $2
   5     2        INIT_FCALL                                               'var_dump'
         3        SEND_VAR                                                 !0
         4        DO_ICALL                                                 
   6     5        INIT_FCALL                                               'var_dump'
         6        SEND_VAR                                                 !1
         7        DO_ICALL                                                 
         8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0